central meridian

central meridian

The imaginary N–S line bisecting the disk of a planet, satellite, etc., used as a reference.

central meridian

[′sen·trəl mə′rid·ē·ən]
(astronomy)
The meridian of a planet that crosses the center of the visible face of the planet at a given instant.

central meridian

central meridian
The longitudinal line of symmetry of a map projection and, generally, a baseline for referencing the projection to the associated grid coordinate system. As such, grid north and true north are coincident along the central meridian, but at any other point of the projection, grid north and true north diverge as a function of geodetic latitude and longitudinal distance from the central meridian as a result of the convergence of the meridians. Most map projections portray meridian convergence, but one notable exception is the Mercator Projection.
References in periodicals archive ?
Once the longitude of the central meridian has been established you can easily work out the longitude of groups on the disk by adding degrees for those west of the meridian and subtracting degrees east of the meridian.
Note that the value of N here is the North ordinate from the origin which is the intersection of the Central Meridian and the Equator, and the False Northing therefore needs to be added in later.
In what is thought to be the first example of a distributor offering free training for staff in its fascia stores, AF Blakemore & Son's Guild Academy provides business development training for Spar retailers across its Central Meridian Guild area.
Therefore, scale is true along the parallel circles and along the central meridian.
It recommended more green spaces, a central meridian on Lankershim, and more and smaller parking structures and - hold on a minute, here - smaller parking structures?
Because I was walking along a route I didn't choose - there's only one central meridian - I came across places I'd never heard of.
31, 1996--All features and functions of the Meridian Series 2000 Digital Deskset can now be cost-effectively extended from a central Meridian PBX to remote locations using Coastcom's new MX Series digital phone extender with the D/I MUX III Intelligent Multiplexer.
AR1043 N25[degrees]/324[degrees] continued across the disk from the previous month, approaching the central meridian on Feb 1 type Hsx with an area of 30 millionths.
Central Meridian Spar wholesaler AF Blakemore undertook a "root and branch overhaul" of its fresh produce offer last summer, when it was faced with falling sales and disillusioned customers in the 194 Spar outlets in its Tates stores division.
The projection devised by Littrow in 1833 is not only conformal but also has the property that all places located on the central meridian have the property of being retro-azimuthal (Maurer 1919).
Traditionally, feature positions on Jupiter and Saturn were determined by transit timings, but these required the feature to be on the central meridian at the time, and provided no information on latitude, which was difficult to determine accurately in the visual era.
Thirty stores within Spar's Central Meridian Guild area will be given the opportunity to achieve Investors in People status in an initiative by AF Blakemore and the Learning Skills Council.

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